Question

The magnetic field 35.0 cm away from a long, straight wire carrying current 5.00 A is...

The magnetic field 35.0 cm away from a long, straight wire carrying current 5.00 A is 2860 µT.

(a) At what distance is it 286 µT?
?? cm

(b) At one instant, the two conductors in a long household extension cord carry equal 5.00-A currents in opposite directions. The two wires are 3.00 mm apart. Find the magnetic field 35.0 cm away from the middle of the straight cord, in the plane of the two wires. How far is the point of interest from each wire?

?? nT

(c) At what distance is it one-tenth as large?
  
?? Y

(d) The center wire in a coaxial cable carries current 5.00 A in one direction, and the sheath around it carries current 5.00 A in the opposite direction. What magnetic field does the cable create at points outside the cables?
  ?? nT

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